Do not use short_description in section docs for elements. We extract them from element details and there will be war...

Original commit message from CVS:
* ext/dc1394/gstdc1394.c:
* ext/ivorbis/vorbisdec.c:
* ext/jack/gstjackaudiosink.c:
* ext/metadata/gstmetadatademux.c:
* ext/mythtv/gstmythtvsrc.c:
* ext/theora/theoradec.c:
* gst-libs/gst/app/gstappsink.c:
* gst/bayer/gstbayer2rgb.c:
* gst/deinterlace/gstdeinterlace.c:
* gst/rawparse/gstaudioparse.c:
* gst/rawparse/gstvideoparse.c:
* gst/rtpmanager/gstrtpbin.c:
* gst/rtpmanager/gstrtpclient.c:
* gst/rtpmanager/gstrtpjitterbuffer.c:
* gst/rtpmanager/gstrtpptdemux.c:
* gst/rtpmanager/gstrtpsession.c:
* gst/rtpmanager/gstrtpssrcdemux.c:
* plugins/elements/gstinputselector.c:
* plugins/elements/gstoutputselector.c:
* gst/videosignal/gstvideoanalyse.c:
* gst/videosignal/gstvideodetect.c:
* gst/videosignal/gstvideomark.c:
* sys/oss4/oss4-mixer.c:
* sys/oss4/oss4-sink.c:
* sys/oss4/oss4-source.c:
Do not use short_description in section docs for elements. We extract
them from element details and there will be warnings if they differ.
Also fixing up the ChangeLog order.

plugins/elements/gstinputselector.c

@@ -24,7 +24,6 @@
 
 /**
  * SECTION:element-input-selector
- * @short_description: N-to-1 stream selectoring
  * @see_also: #GstOutputSelector
  *
  * Direct one out of N input streams to the output pad.

plugins/elements/gstoutputselector.c

@@ -19,7 +19,6 @@
 
 /**
  * SECTION:element-output-selector
- * @short_description: 1-to-N stream selectoring
  * @see_also: #GstTee, #GstInputSelector
  *
  * Direct input stream to one out of N output pads.